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ksh; trap math errors

Posted on 2006-07-17
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Last Modified: 2013-12-26
How do you protect math operations like

(( result = num1 * num2 + num3 / num4 ))

from killing the program.   I can check all the variables for null values, numbers
only and zero, when important, but is there a way to skip all the checking and just trap it?

I can check for an legit result value later.

Thanks

ksh
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Question by:hank1
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7 Comments
 
LVL 5

Expert Comment

by:bastibartel
ID: 17121628
Hi hank1,
try
{
    double nom = 1.0;
    double den = 0.0;
    double res = nom/den;
}
catch (...)
{
    fprintf(stderr;"Some unknow exception occured\n");
}

Cheers!
Sebastian
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 17121723
> but is there a way to skip all the checking and just trap it?
don't use a shell for math calculations, ther tons of better tools for that
0
 
LVL 1

Author Comment

by:hank1
ID: 17121794
try catch?.. in ksh?
Ok, I'd rather use perl for this stuff but this is a ksh script and that's that.  :-)
I sensing that this is a check all the vars thing.
0
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LVL 1

Author Comment

by:hank1
ID: 17121896
I came up with

result=`echo "expression" | bc`

then check the result.  Divide by zero contains the string 'divide'.  Lame,
but beats the lines and lines of checking.

 I'll delete the question.
0
 
LVL 5

Expert Comment

by:bastibartel
ID: 17123747
:-)  sry - didn't see the reference to ksh.
0
 
LVL 5

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In Percona’s white paper “Performance at Scale: Keeping Your Database on Its Toes,” we take a high-level approach to what you need to think about when planning for database scalability.

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